Hang upside down until they dry. My daughter's florist told her to do that with her bouquet and it looks great 2 years later.
If you mean cut roses, tie a bundle together (using twine or rubber bands) and hang upside down in a dark space for several weeks. They will dry beautifully.
Hi Steve. I'm Cindy. If your roses are already cut, you can preserve them by putting good old-fashioned white vinegar in the vase mixed with water. Doing this will keep them for a much longer time. Another way to preserve fresh flowers is by spraying them with hair spray. Good luck Steve.
Thank you try both.